In a post-IPO world, Facebook isn't doing too well, shares are down 19-percent since their launch in May, down to $30.72. Facebook founder Mark Zuckerberg has said right now, his hardest job is figuring out how to adapt Facebook to mobile devices.

Zuckerberg said in an interview from the Allen & Co. media conference that bringing Facebook's features to smart devices is difficult because the user experience is vastly different to that of a desktop PC, at the same time Zuckerberg placed down the problems of running a newly public company. Zuckerberg said "things are not much different". "I'm focused on building product".

Facebook is currently under pressure to grab more advertising revenue from its mobile service in order to maintain growth. In order to do this, Facebook are developing location-based features that will allow marketers to target users with more relevant pitches.